Calculator



FIG. 1 is a top perspective view of a calculator showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image thereof;

FIG. 4 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a calculator, as shown and described. 